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Finding the Fourth Proportional to 905.25, 1,355.23 and 557.54

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Solution

The fourth proportional to 905.25, 1,355.23 and 557.54 is: 834.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.25 : 1,355.23 = 557.54 : x
  2. Step 2: Convert to fraction form
    905.25/1,355.23 = 557.54/x
  3. Step 3: Cross multiply
    905.25x = 1,355.23 × 557.54
  4. Step 4: Simplify right side
    905.25x = 755,593.94
  5. Step 5: Solve for x
    x = 755,593.94/905.25
  6. Step 6: Final answer
    x = 834.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.